This is an animated PowerPoint presentation that covers section 4.1 Ecosystems of the Edexcel IGCSE Biology course.
The PowerPoint covers the following questions:
Can you define the terms population, community, habitat and ecosystem? How would you use a quadrat to estimate the population size of an organism in two different areas? How would you use a quadrat to measure the distribution of organisms? What are food chains, food webs, pyramids of number, pyramids of biomass, and pyramids of energy transfer? What are the names given to different trophic levels? How are substances and energy passed along a food chain? Why is only about 10% of energy transferred from one trophic level to the next? What are the stages in the carbon cycle What are the stages in the nitrogen cycle? You should be able to recall the roles of bacteria (but specific names of bacteria are not required). What are the stages in the water cycle?
The PowerPoint is designed to directly address each relevant point in the syllabus. It is simple and straight to the point covering the topic in just the right amount of detail.
It's a fantastic resource for both teachers and students or a great tool for revision.
Many of the slides have animations in that will only work when viewed in slideshow mode, so please use that when working through the presentation.